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    A scheme for theoretical and experimental evaluation of multivariable system stability robustness (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A scheme for theoretical and experimental evaluation of multivariable system stability robustness measures is described. The experimental scheme is based on the estimation of frequency responses from power-spectra analyses of a set of time responses due to sine-sweep excitation at each input and then computation of the appropriate singular values. The procedure can also be used on an open-loop stable system to predict the closed-loop stability before closing the loop. Classical Nyquist diagrams can also be constructed to determine one-loop-at-a-time gain or phase margins. The scheme has been implemented in a wind tunnel test for singular-value evaluation of digital flutter suppression control laws and compared with theory. The singular values at the plant input and output of the actual system and the theoretical model are qualitatively similar but have some discrepancies.
    Keywords: CYBERNETICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Design of the flutter suppression system for DAST ARW-IR (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The design of the flutter suppression system for a remotely-piloted research vehicle is described. The modeling of the aeroelastic system, the methodology used to synthesized the control law, the analytical results used to evaluate the control law performance, and ground testing of the flutter suppression system onboard the aircraft are discussed. The major emphasis is on the use of optimal control techniques employed during the synthesis of the control law.
    Keywords: CYBERNETICS
    Type: NASA-TM-84642 , NAS 1.15:84642 , AIAA/ASME/ASCE/AHS 24th Struct., Struct. Dyn. and Mater. Conf.; May 02, 1983 - May 04, 1983; Lake Tahoe, NV; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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